Improvement in eotary steam-valves



gnitrh States gaztrnt @ffice R. A. FILKlNS, OF NORTH ADAMS, MASSACHUSETTS, ASSIGNDR TO HIM- SELF AND W. B. WERDEN, OF WAUKEGAN, lLLlNOlS.

Letters Patent No. 71,73a0, dated December 3, 1867.

IMPRVEMENT 'IN ROTARY STEAM-VALVES.

TO ALL WHOM IT MAgY CONCERN:

Be it known that I, R. A. FILKINS, of North Adams, Berkshire county, Massachusetts, have, invented a new and improved Steam-Valve; andI do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to'tho accompanying drawings, forming part of this spccication, in which- Figure 1 represents a vertical longitudinal section of my improved steam-valve.

Figure 2 is a plan view of the valve-seat, the valve itself being removed.

Figure 3 is an inverted plan view of the face of the same.

Similar letters of reference indicate corresponding parts.

This invention relates to a conical steam-valve, which has a-perfectly smooth lower base or face, and which rests on a seat in which the channels for the steam-passage are arranged.

A passage is provided in the valve, which, when brought in line withthe steampipc, connects the twoi'parts of the same, while otherwise it can bc so set that the passage will be completely or partly interrupted, as may be desired. When the passage is thus interrupted, the steam will bc. made to press the valve upon the seat, thereby preventing all escape, and making steam-tight joints without the use of packing of any kind.

AA represents a section of the pipe, in which the steam flows in the direction indicated by the arrows in iig.

1. Il isa circular valve-seat, formed in the pipe, and communicating with the same by ports a and b, as shown,

a partltion,j, in tho pipe. itself interrupting the communication'. A circular iiange, c, is formed around the seat B, and projects therefrom, as is clearly shown in gs. 1 and 2. C is the valve. The same is made in the shape of a hollow truncated cone, iitted to a vertical stem, D. The lower `surface is of smaller diameter than-its seat B, and is made perfectly smooth,so as to turn easily on the said scat. Two ports or holes, d and e, are arranged in the lower face-plate of the valve, said holes being made so as to {it over the ports a and b respectively, when the valve is open. The valve is surrounded by a ease or shell, E, which is partly conical, partly cylindrical, as shown, the conical portion surrounding .the valve, whilo the stem D is fitted through the cylindrical portion of the valve. This shell is screwed into lthe flange c, as shown, and the further it is screwed down, themore will its conical inner face press uponlthc valve. The upper endof the valve itself lis also cylindrical, and lits into thecylindrical pat of tl1e-shell,fand has a steel shoulder, m, on top, upon which a steel ring,f, rests, which is held down, and the top of the shell closed by a nut, I", as shown. The top of the stem is provided with a handle, g, by which the valve may bctnrncd. A small pin, h, projects from the face B, through one ofthe ports in the lower face-plate of the valve. This pin prevents the valve fromV being turned` too far in either direction, as it then strikes against one of the en ds of the said port. When the valve is turned, so that tho ports d and e are not above thc ports a and b, or any part thereof, then a small hole, t', in the face-plate of thcA valve, will be above the port a, and will admit steam into the valve, which steam cannot escape, but which will press the face-plate of the valve firmly upon its seat. By means of the nut F, the pressure of the valve upon its face-plate may be increased at pleasure. v

It will be seen that this valve can be thus kept steam-tight, without the use of packing of any kind.

Another advantage is, that, for turning the valve, no screwing is needed, the valve always .bearing well upon its seat, whereby also thc accumulation of dirt is'prcvcnted. The higherthc steam-pressure, the tighter will thevalve fit on its seat when closed, as so much more for'c will be employed to press thc valve upon the seat.

By opening the valve but partly, a smaller quantity of steam will be admitted; but the steam will not'h'ave the tendency to open the vnlvc more when the same is partly open; on the contrary, itwill tend to keen and retain the valve in any one particular position.

Having thus described my inventiomwhat I claim as new, and desire to secure by Letters Patent, is Y The construction of thc hollow conical valve C, and its arrangement witlrthe shell E, nut` F, iiange c, partition j, ring f, shoulder m, and pipe A, all made and operating substantially as and for the purpose herein shown and described.

R. A.v FILKINS.

Witnesses:

JAMES D. COLT, S. W. BowEuMAN. 

